A104107 a(1) = 1, c(1)=1, if A(k) = sequence of first c(k) terms and if B(k) is A(k) with 0's and 1's exchanged, then A(k+1) = A(k)B(k) and c(k+1)= 2*c(k) if a(k) = 0, A(k+1) = A(k),0,B(k) and c(k+1)= 2*c(k)+1 if a(k) = 1.

1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0

Offset: 1

Author

Leroy Quet, Mar 04 2005

Keywords

• easy
• nonn

Crossrefs

Cf. A104104, A104105, A104106, A104108.

Programs

Mathematica

f[l_]:=Join[l,If[l[[Floor[Log[2,Length[l]]]+1]]==0,{},{0}],1-l];Nest[f,{1},7] (* Ray Chandler, Apr 05 2009 *)

Extensions

Edited and extended by Ray Chandler, Apr 05 2009